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    <title>DTMF</title>

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    <h1><a href="../../../../index.html" title="WebRTC samples homepage">WebRTC samples</a>
        <span>Send DTMF tones</span></h1>

    <div id="dialPad">
        <div>
            <button>1</button>
            <button>2</button>
            <button>3</button>
            <button>4</button>
        </div>
        <div>
            <button>5</button>
            <button>6</button>
            <button>7</button>
            <button>8</button>
        </div>
        <div>
            <button>9</button>
            <button>0</button>
            <button>*</button>
            <button>#</button>
        </div>
        <div>
            <button>A</button>
            <button>B</button>
            <button>C</button>
            <button>D</button>
        </div>
    </div>

    <div id="dtmf">
        <h2>Sent tones</h2>
        <div id="dtmfStatus"></div>
        <input type="text" disabled style="width: 80%" id="sentTones" />
        <audio autoplay="autoplay"></audio>
    </div>

    <div id="parameters">
        <div>
            <label for="duration">Duration:</label>
            <input id="duration" type="range" value="500" min="70" max="6000">
            <span id="durationValue">500</span>
        </div>
        <div>
            <label for="gap">Gap:</label>
            <input id="gap" type="range" value="50" min="50" max="1000">
            <span id="gapValue">50</span>
        </div>
        <div>
            <label for="tones">Tones:</label>
            <input id="tones" type="text"
                   value="1199##9,6633221,9966332,9966332,1199##9,6633221"/>
        </div>
    </div>

    <div id="buttons">
        <button id="callButton">Call</button>
        <button id="sendTonesButton">Send tones</button>
        <button id="hangupButton">Hang up</button>
    </div>

    <a href="https://github.com/webrtc/samples/tree/gh-pages/src/content/peerconnection/dtmf"
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